%0 Journal Article %A Kazimierz Szymiczek %T Abstract Grothendieck rings %J Colloquium Mathematicum %D 1987 %P 17-25 %V 53 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-53-1-17-25/ %R 10.4064/cm-53-1-17-25 %G en %F 10_4064_cm_53_1_17_25